If you like solving puzzles, periodically,
Then this may suit your particular body chemistry.
One is partly controversial but makes hard teeth with just a trace,
Two is notoriously poisonous and sometimes seen with old lace.
Three made the Hindenburg rise and fall disastrously from the sky,
Four is most essential, without Thyroxin you would surely die.
Five is up in the air and to life it is very dear.
Six is like your favourite pub, a lot to do with atmosphere.
Put us all together and we wield economic power,
A magazine? ; a dress ? ; a trend? ; I change by the hour.
What am I?

Hint

The full quote in the title is from Sherlock Holmes: "Elementary my dear Watson."Hide